A #37 drill measures 0.1040 inch (2.642 mm). The closest fractional drill is 7/64" (0.1094") and the closest metric drill is 2.6 mm (0.1024"). It is the standard tap drill for #5-44.
What are the #37 drill equivalents?
| Drill | System | Decimal (in) | mm | Difference (in) |
|---|---|---|---|---|
| #37 | number | 0.1040 | 2.642 | 0 |
| #38 | number | 0.1015 | 2.578 | -0.0025 |
| 2.6 mm | metric | 0.1024 | 2.600 | -0.0016 |
| 2.7 mm | metric | 0.1063 | 2.700 | +0.0023 |
| #36 | number | 0.1065 | 2.705 | +0.0025 |
Tap drill for: #5-44.
Drill sets that include this size
Number and letter sizes come in indexed sets; buy the set rather than single drills.
What speed should a #37 drill run?
| Material | RPM (HSS) | Feed (in/rev) |
|---|---|---|
| 6061-T6 aluminum | 7,346 | 0.0021 |
| 360 free-machining brass | 5,509 | 0.0019 |
| 1018 cold rolled steel | 2,938 | 0.0016 |
| 304 stainless steel | 1,469 | 0.0010 |
Starting points from conservative HSS drilling speeds. Small drills often call for more RPM than a benchtop drill press offers; run at the top speed and feed gently. Use cutting oil in steel and stainless, and clamp the work: never hold it by hand.
Cutting fluid for drilling
Frequently asked questions
What is a #37 drill in inches?
0.1040 inch, which is 2.642 mm. Number drills get smaller as the number rises, so the next number up is a smaller drill. If you do not have this exact size, 2.6 mm is within 0.0016 inch.
What tap uses a #37 drill?
It is the standard 75% thread tap drill for #5-44. Tap drills are chosen to leave about 75% of full thread depth, the balance of strength and tapping torque that published charts use.